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基于离散-连续耦合方法的隧道压力拱特性研究
Research on tunnel pressure arch based on coupled discrete and continuous method
引用本文:高峰,谭绪凯,陈晓宇,丁其乐,李星.基于离散-连续耦合方法的隧道压力拱特性研究
Research on tunnel pressure arch based on coupled discrete and continuous method[J].计算力学学报,2020,37(2):218-225.
作者姓名:高峰  谭绪凯  陈晓宇  丁其乐  李星
作者单位:重庆交通大学 土木工程学院, 重庆 400074,重庆交通大学 土木工程学院, 重庆 400074,中机中联工程有限公司, 重庆 400039,林同棪国际工程咨询(中国)有限公司, 重庆 401121,重庆交通大学 土木工程学院, 重庆 400074
基金项目:国家自然科学基金(51778095);重庆高校创新团队建设计划(CXTDX201601024);青海省交通运输厅科技项目(20177)资助项目.
摘    要:隧道压力拱问题一直是隧道工程研究的关键问题,目前常用的连续介质数值模拟方法对于隧道压力拱特性的微观研究有所欠缺,而擅长微观力学研究的离散元数值模拟方法对计算机存储空间和计算时间的要求太高。基于现有离散-连续耦合思路,通过力的传递实现离散-连续模型的耦合;研究了耦合算法中的平均应力计算方法、平均应力计算区域面积及耦合程序遍历颗粒方法;基于自行开发优化的离散-连续耦合程序,模拟了隧道开挖后的围岩受力特性,研究了隧道压力拱形成机理及压力拱特性;计算了埋深分别为10 m,14 m,18 m,22 m,26 m,30 m和34 m情况下的隧道开挖产生的压力拱应力集中等效区域,揭示了隧道压力拱随着隧道埋深的变化规律。研究结果表明,自行开发优化的离散-连续耦合程序能在保证计算精度的前提下,充分发挥离散元方法在微观力学研究方面的优势;隧道开挖后,开挖面周边范围出现层状压力环,但在拱顶和仰拱底附近区域的围岩压力环的环间接触力降低,围岩承载能力急剧降低,形成压力拱;随着隧道埋深的增加,隧道压力拱应力集中等效区域减小,隧道周边围岩的压力拱承载能力越来越大;但当隧道埋深达到一定界限后,隧道压力拱高度趋于稳定。

关 键 词:离散-连续耦合模型  隧道压力拱  隧道埋深  压力拱应力集中等效区域  力的传递路径
收稿时间:2019/4/27 0:00:00
修稿时间:2019/8/12 0:00:00

Research on tunnel pressure arch based on coupled discrete and continuous method
GAO Feng,TAN Xu-kai,CHEN Xiao-yu,DING Qi-le and LI Xing.Research on tunnel pressure arch based on coupled discrete and continuous method[J].Chinese Journal of Computational Mechanics,2020,37(2):218-225.
Authors:GAO Feng  TAN Xu-kai  CHEN Xiao-yu  DING Qi-le and LI Xing
Institution:School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China,School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China,CMCU Engineering CO., LTD., Chongqing 400039, China,TYLI China, Chongqing 401121, China and School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract:The pressure arch of a tunnel is a key problem in tunnel engineering.There is a lack of microscopic study of tunnel pressure arch characteristics as a continuous by a numerical simulation method.The discrete element method which is good at microscopic study requires a large computer storage space and a long calculation time.The discrete-continuous coupling model through the transmission of force is built based on the existing model.Calculation methods of mean stress,calculation area of mean stress and traversal particle method of coupling procedure are researched.The stress characteristics of surrounding rocks after tunnel excavation,the formation mechanism of a tunnel pressure arch and the tunnel pressure arch characteristics are studied based on the self-developed and optimized discrete-continuous coupling model.The equivalent area of stress concentration of a tunnel pressure arch generated by tunnel excavation is calculated under different buried depths of 10 m,14 m,18 m,22 m,26 m,30 m,34 m,which reveals the variation law of a tunnel pressure arch with tunnel burieddepth.The results show that,the self-developed and optimized discrete-continuous coupling model can not only ensure the calculation accuracy,but also give a full play to the advantages of discrete element method in microscopic study.Layered pressure rings appear near the excavation face after tunnel excavation,and the indirect contact force between the layered pressure rings of vault and invert bottom reduces,the bearing capacity of surrounding rock decreases.The equivalent area of stress concentration of a tunnel pressure arch is decreasing with the increase of tunnel buried depth,and the bearing capacity of a tunnel pressure arch is increasing.However,a tunnel pressure arch is stabile when the tunnel depth reaches a certain limit.
Keywords:discrete-continuous coupling model  tunnel pressure arch  tunnel burial depth  equivalent area of stress concentration of tunnel pressure arch  path of force  PFC2D
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